What is the purpose of men in the Army wearing green face paint?

Cryptic-Game
What is the purpose of men in the Army wearing green face paint?
I've seen many men grouped together with their military weapons and they would have green face paint on but it always was a mystery to me as to why.

Can you clue me in as to why they wear green face paint? Why green? To match or camouflage?

Why do you rarely get this in other branches of the military? I've never seen a Marine with red face paint, an Airman with blue face paint or a Navy man with white face paint.

Please explain this to me! I am missing something and don't get it.
What is the purpose of men in the Army wearing green face paint?
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